Small fix

lark-parser · Jan 20, 2019 · c4f8483 · c4f8483
1 parent 8cc5337
commit c4f8483
Showing 1 changed file with 1 addition and 2 deletions.
diff --git a/lark/load_grammar.py b/lark/load_grammar.py
@@ -510,8 +510,7 @@ def compile(self):
 
                 empty_indices = [x==_EMPTY for i, x in enumerate(expansion)]
                 if any(empty_indices):
-                    assert options
-                    exp_options = copy(options)
+                    exp_options = copy(options) if options else RuleOptions()
                     exp_options.empty_indices = empty_indices
                     expansion = [x for x in expansion if x!=_EMPTY]
                 else: